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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a474dba7a5054eeaa135a028f6e9aaa915a3c1753868d47e2959a12eed1690' 
  AND token = 'J37T48hBOVotTXfG3gWIpGvgvyDMH6eQMCmGmT7FzDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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