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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7f6e9006839b8ab41ed5de199d1208e4901cdef0bc03113a5c56648eba6ab5' 
  AND token = '4eKloGt/XcvhJyVw4prhCjCeZxNTl5m1v/NgNeAwkug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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