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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b695b2ba0299a324b7b68af397946aa508468fff6320b62ceecd5d27bb319548' 
  AND token = '648Zl8bp3Ah5XCsarutF0o6u0lHPfMM1p8cEf1kk+8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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