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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef58aa3681cf323b8e34b9f3f8aa7c1759dd2ed3fe0f345f528b78589f5278f4' 
  AND token = '+bP3le99nac28h6+87Yt3eiuuKNhZYgKQH9/VHDhM0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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