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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af566502be32036a1035baf7fadd56c0075fd5e4dc5302ca03ce4679f53bf55' 
  AND token = 'KrvwZ0HctyS0MiiybM7tAz9yWCdjRtEGV/Za2fU2sMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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