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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6e485ef0b18afddacd2e296d963f27407f1bbcd9d65b2393fe5d59683a21f7' 
  AND token = '76sVniZmplW1wEDReGg7dSbM0K8r3LLILHEQLwi2L3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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