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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc28ad7f060a31223f33ef2571116ebb51b0b0d70205920b94115655d85257b' 
  AND token = 'DF5WamAj2Po6BX2FDNvu+jQNz6+NHMnuV27j6JpK97k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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