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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42b7ab243ddc0662fa8246f957047a79f4dea953f5f81737dac2f3e182763e6' 
  AND token = 'vm0SSBzCf3x6ZAxv82OZWNgk2WRYtZjNNlfcI7ezd2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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