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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5307017b8eddf2b6a3d58a067b41b13bbd2fc7852faeff26ae54d4831e4cf5b' 
  AND token = 'XRqJb3wLhL1+Xryf6aT1mJkHI/RXC2mLkOWiogxLkek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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