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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5933e07977853a2e499f54add7f359a4dfb57918310f0f59578a32902527d9a' 
  AND token = 'PUpALsUIMlcxVYVChcIgsYFPGOSS4/tcIdJdM2tkG6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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