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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b785ad903f4d94e2f99f35678deaa1e332c29c6bb1af5b11cb226d06c81b26a8' 
  AND token = '5SA+DTXZUa+suTm+2h37nZYQGL58RX4M1UqB3VkSCdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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