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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94b6f713c580fb02e1c1e3f0917449a88e4a035e04bb2c8ed6e41314de09c76' 
  AND token = 'b1QeGFhA/j+ciyy49/nfk6mdyX7jvA5fphcwW22q7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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