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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd50eb5cd288948647f13305fd99dd5a1a99898c6e0fc07015f1f9c1e28de77' 
  AND token = '005qfVzvS1AqsE7kgjPmIJ3fAOgX1IN+Y5L2P15jCi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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