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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba45a0d24a72070ddc76b7bdc27a76f84667b098888623ca3ab3840e1cda282' 
  AND token = '7BtotjChMcPxEU+MOsiIvMBx4XCczM9mx3zh7yNxfpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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