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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6140b361ebe34137d3685c2468add9002bf7a4d1df86fff017cac608480a77ed' 
  AND token = 'QyEYkopkn5xn97S3zBl3slkOOUHdZ7kkPp3/RZuoLRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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