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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d6f854ba8586de717a41e734bc0a0b121afd3ba4b0cce3a469654c70d11683' 
  AND token = '17xuqZEOOHa0nJ3mjTVTW1KNFfyNWhopf2EjQY8HGj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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