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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7c2dc7a33c3e1c3d011c674c4c5da13b5f0867a84f254c5ef051e726ada9ba' 
  AND token = 'k3R+2jNgk+pizZReOcES7FdZLfLCSQi4otQWENpK9lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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