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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886706662a7467dab7a6062a352a47f06623a34937daedc62efc0bcf339189ca' 
  AND token = 'a6Jmf8/Z+0dn8whHLtLW8qP/RP3Qoh2PuE3n/l17Ysk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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