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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148410edd5c6a09f31407266f3517f0b0474e34c1f5b8393bd0d202d86c83495' 
  AND token = '70rlabgr7fVFVxVurEJWvGXyGHIa245wb4tsduzAKTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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