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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef14c103e95a33027e231cb7ee63a05262b451f2ca2e6d2a88c47a4b5f9d3f6e' 
  AND token = 'npOQDPfKc0z03ziaLsq74Mdq/PE4llNJsQQONSWARoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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