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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e5595c1d3d844a152836e691ca6a0f85e95645d71992ab0bb034678283115e' 
  AND token = 'IGRenZwoLfRchyc3ePzJ/GID5jGthRnA/R2WD2wZhnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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