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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a9fa60f5de50fa07e9ce170affa8947fcf45207a2baaa686df2b73d016701b' 
  AND token = 'infMJPOxSvz+EHYu/sl/eLmWc62CGB6KJz7LDW3ybXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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