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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b65698356ed42b4c11d1747aedc1a79e7304c1beb4162cd334e114fca7548a' 
  AND token = 'uzOg9gP01FDtj9XfaGfbHkJm7H96HmJagImRiaskftk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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