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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfb588e3f8c609797aaa5ce0c8c6f762674862537d3379c985f3d450ca0f88f' 
  AND token = 'RMMHVaYC2Gj5zdlCvUfiy8cFME2aJWDgy5O1egnvjYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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