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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0b532de813ecb5c42a1dcb5c11d5247caffdacdf5a42a6901ab5e8a01bf3c2' 
  AND token = 'fZUkZrFSGgI5J3KleNbJP15A5D5n0IftZQW63nskYlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}