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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4396f2dd838b0ee30983e9436443d5943a9598d0bd4a080e1d627eb1c4cc86' 
  AND token = 'AfukdMl/I23iiY295+ZtYEr2inDm3p0EYraDFOU01D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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