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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fd504384e2f96b9be60092c6cd779e10ee2d5f29c04725b1efce5bd24918a8' 
  AND token = 'umklHG7ySkMM3sFapReIZdR3TYh91yYdPNWDQWGeYho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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