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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d40b9d13b69dcff431e0cda8955da9ae884e3006af9115d0ac0f19b3dd8d1a' 
  AND token = 'aqAvo3DMoG1YILXFnvGhwhKhMUjkHu2T52HnB3u8pao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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