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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26d845a95e5b4ebad105e93100712f3ea96cad6eb51820b10f403d2894d5809' 
  AND token = 'tGK8G8URqhYTSzGcuXGX4MtJiZj6qQEr+e990BPjQDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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