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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01956d5ff92b1cd04057773d61468e9a09044ef138d3a4388a9dae850dc2bca3' 
  AND token = 'nK3utv+nrNnu1fClOxS3RtQi54zAQ+BeAUc7hLJCP08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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