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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dc272f9d4f0f1069eed71ea7becd8a1cab00e613decf269ac6374461afdcf6' 
  AND token = 'x9SBgu/3ZZ39wBakZFp1nP0oIeCUCycbjvHEA39tDxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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