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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22ec1830feb7fa37c58a86ea58d36bfaad8b00097c8ab42257107ed29875847' 
  AND token = 'iWJpq8iTGo82OEyLk7Cmo5JEG83eRM0A1H+d1UJq63c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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