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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ec640815e99f35bd283d33e8d5c957ec11dab294b8d923a97444d8ffe0a69b' 
  AND token = 'wpCmIpxkmjN7OaA6ReNTdM8sCNkpQU8R76LLscgoChc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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