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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316f3161966299433e0931e7854cb4a95d1ec724fd6c4de8dd05ff1c53942aaf' 
  AND token = '8X9vAY+wQ/1uOt+65fS9yB/8lq5/3iHWkFlTri5HqPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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