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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5d8024d6e3e1d63f4c767175e25960fbcee3c92ebaee02b995fb9023b38c8f' 
  AND token = 'Npd+ws+TRFWw+Mzg5Sjx+fIkCgJ6B1pVpa+Z1RZZ9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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