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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca980a39a122620f3db617f073c831272dc4c921c6f797916a37ef3965f4586' 
  AND token = 'P65Sy/YDH1EWvv83B/tJQcPV3yc0dgvvXizk3P2GNm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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