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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965d057e8502903985a3d065ec8b8903fda72105ecdfdd5255bca01bc2e4a3fa' 
  AND token = 'nSnW9fhDx8Wg5RGGOPAj02Th0VnE0R2WU03Jd7+xEC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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