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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0967af02ff23ae30d248d56cb06f889c14bf26046a32c0c4a94fa9827e0d2b3' 
  AND token = 'VkvWmCEaaev4xOLV4vN7xe5357qk/BnuQ+r8Y3x/pk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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