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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b67acfb19c31c249c2d024e029eae474c66e0ea9b7564cf3520ebb5eb6ffe27' 
  AND token = 'LHx60bhm31/859Jl1spEPeZlHvsE4Q7PljU6JD9FcrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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