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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5a9b766e2a5b3c6401e06a1a22c07ccda6979547171196c8e5569189d679d3' 
  AND token = 'fJLKXK5YUX8iZS+jjqGeEJ96b+zeWCxa9GOWc7YHofk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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