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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df15ecb8580a17b8f7d63f1ffc4e732f8700d7fdc1b6453896298548621437f0' 
  AND token = 'H4nbO1cCiOIor/V0joK28na2oIGGfEbw6+m/VWY/50s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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