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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234ce5846d85f857046eec9958ba2b91e69b53d1356a2ea0605b0ae2608dbdbb' 
  AND token = 'EcH4quXGy9a3BkJI2aK/otcK+f2OLal63l4+oY7XIPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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