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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f1aa22fb56408555adddc2b426abc66c1cb660db476d5e430d4014b7161f16' 
  AND token = '5d90qS4xhWfW+PFSlP/KrmqqSzPwmmZilUZuswcei2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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