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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9052a1fe401bd79b0c94f05dbca32f5da5718e2f8b0a01b25590a1ef960df73d' 
  AND token = 'dRAnFbUIlmaoTRpdJhK34+ETed1bQHM8sOerare2H1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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