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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc206d8d25c33e4098834e96de6bee6e4e684e7c582ea37b1bdf0d581a25c05b' 
  AND token = 'RUC67QZFycOsjjRrRCNYmFp2I1iwyBhmZLnoOsfLFz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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