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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db3ce388ce3aefc12a84a09651c56e5eea9deb8f20f21762d14eef39dfc0e2a' 
  AND token = 'HNDifRNYfJvBIzej8CvFri7htRY/XQQhwsd+iwIF8e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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