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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078f6c42d0399c378fc13737d682babe3a066ae2ab20284e0485dc97f6aee417' 
  AND token = '61s6fU3oHBpLLprThu5mgNNAdQhfZl/57Xij30rchn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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