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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b466da43ac6ab43f715711abdb206e144dd8cab52753770cca3e067e226b2d82' 
  AND token = 'rtvG4IWC4fmZ1kIZWQ5A2h8ZlsPK98PE5ma9SbzHncs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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