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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b339d147cba905de6fadc1d5c017557a05a2e304581e82e52dfdf5f23f5e3faf' 
  AND token = '/RYNUA4GryirG+vg2+bouM5CARYJ0fZGzC1GpqGwdV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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