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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf6d7fb84fbf608c1a561163e8b509984e4d174e291cb3138f63404538081b' 
  AND token = 'e6Uszfr/4ZXxPdtjbmyxVvdEz627PLUR6ERywJG2KoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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