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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931cd5331700496729383e73b1b55bb3f9ac5c0233035c03eaa948a78b5866c7' 
  AND token = 'dIE8Bpv7OljFMj0rwn0VRdHMW3iCdYse23mWTRO/y4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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