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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedb2a0ec24fc5fc09e85b35c3b1d0570db6cf6393fc862e6ca01a1190e685ed' 
  AND token = 'zy6Foj14FlQEN31p8C6hyXuoenvtLEQ0h0coJaH/SFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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