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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37a99de196ca9d927f2b6777aab8687226aa4e7f6401e419f891d321fe18b29' 
  AND token = 'TzejW43bpGBXWu5egkyACyGVifIXN79MjlAN+CRq+Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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