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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e132eac53c4c268f13ed217bf4e47588cedb09b04f53df9f8626d63232399932' 
  AND token = 'Ysg7WDnu32Vb1rAOrxOPiGm4ra8TLX5/2+4Nao2qJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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