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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0d2b1ae5d972e19ee81b2d36e7eaac5679e8180c1a21648ed95e57ef32fb57' 
  AND token = 'kzc2aeqBvhS/23SrAueqxynXr95G/0af3i/tpf9C4S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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