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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f9ace7fd47552bf222e6411d481aedd4f4a3aff95d868a7f4fc95301a2e532' 
  AND token = '/VWtDrbCEB/OkIbnb/JiXLXXffrtDQkxM5KWaq0963A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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