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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f99c63edd563a5aae0c3e9166bf0e2ca3f509630010fdb04c0596e16f1a4cf' 
  AND token = 'VqvGeFWJh6JDax/moneKL9qc8zwHT3KSZ3prhYaOVWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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