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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b9f2b02e2b698f51845af03828464502651a1da47488bc4eb490c9dbf4a0e9' 
  AND token = 'SKMpBFN7wWYdvhiMtPl4W1FY5W2joZALD18tHx1fBYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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